//: C10:Depend.h
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Static initialization technique
#ifndef DEPEND_H
#define DEPEND_H
#include <iostream>
extern int x; // Declarations, not definitions
extern int y;

class Initializer
{
    static int init_count;
public:
    Initializer() {
        std::cout << "Initializer()" << std::endl;
        // Initialize first time only
        if (init_count++ == 0) {
            std::cout << "performing initialization"
                      << std::endl;
            x = 100;
            y = 200;
        }
    }
    ~Initializer() {
        std::cout << "~Initializer()" << std::endl;
        // Clean up last time only
        if (--init_count == 0) {
            std::cout << "performing cleanup"
                      << std::endl;
            // Any necessary cleanup here
        }
    }
};

// The following creates one object in each
// file where DEPEND.H is included, but that
// object is only visible within that file:
static Initializer init;
#endif // DEPEND_H ///:~
